Television – Bandwidth reduction system – Data rate reduction
Patent
1993-06-09
1995-05-23
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348415, H04N 732
Patent
active
054185696
ABSTRACT:
A method for predictive coding of moving images consists of the steps of calculating preliminary prediction errors of an original group of frames of moving images, accumulating the preliminary prediction errors to obtain an accumulated value, omitting one or more frames from the original group of frames to produce a decimated group of frames of moving images in cases where the accumulated value is larger than a modified order threshold value Th.sub.2, weighting quantization weighting factors in cases where the accumulated value is larger than a decimated order threshold value TH.sub.3, calculating prediction errors of the decimated group of frames, quantizing the prediction errors with the quantization weighting factors, encoding the prediction errors to produce pieces of output data of which each are composed of a plurality of codes. The amount of the codes of the output data is lower than an upper limit, and the decimated group of frames of moving images is distinctly reproduced by decoding the codes of the output data.
REFERENCES:
patent: 4849810 (1989-07-01), Ericsson
patent: 4999704 (1991-03-01), Ando
patent: 5040061 (1991-08-01), Yonemitsu
patent: 5105271 (1992-04-01), Niihara
patent: 5113255 (1992-05-01), Nagata et al.
patent: 5150209 (1992-09-01), Baker et al.
patent: 5155594 (1992-10-01), Bernstein et al.
Chin Tommy P.
Lee Richard
Victor Company of Japan Ltd.
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